Hi,
You can buy biotin in the vitamins section at Walgreens or CVS Pharmacy. It comes in 1000mcg or 5000mcg and take after a full meal. You need to purchase another vitamin called B50 Complex Vitamin. Do not take both pills together put some space between each. Wait at least 4 or 5 hours after you take the biotin. Please eat a full meal before digesting either pill. Because the biotin is very strong. So make sure you eat a full meal and maybe follow with milk to coat the stomach.
Hope this help, I have started both products today.